Add NPC worldIndex to NPC update packets #433
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Adds 2 bytes (1
short) to the npc update packet that includes theworldIndexof the npc.This is (currently) necessary because the client seems to typically be unable to stay synchronized (specifically, npc order) with the server's tracked NPC list.
The existing npc update packet does not include any bytes of data to indicate which npc should be updated.
Since order isn't preserved, the packet gets processed by the client and it applies the changes incrementally to whatever NPCs it's tracking in its own order.
See accompanying PR for the client: runejs/refactored-client-435#205
edit: previously I coupled a few other changes into this PR, but since this is probably an (understandably) undesirable change, I'm going to remove the other changes into other future PRs